TRANSFORMATIONS OF 3-(1,3-DIOXOBUTAN-1-YL)-3<i>H</i>-CHROMEN-2-ONE DURING THE ACTION OF BROMINE
DOI:
https://doi.org/10.1007/2942Keywords:
benzopyran-2-one, dihydroxyxanthylium bromide, hydroxyxanthene, pyranochromene, brominationAbstract
It was established that the direction of the reaction of 3-(1,3-dioxobutan-1-yl)-2H-chromen-2-one with bromine depends on the conditions under which it is carried out. In acidic media carbocyclization occurs with the formation of dihydroxanthylium bromide or hydroxyxanthene; in chloroform enolization of the carbonyl group with subsequent bromination and heterocyclization to substituted pyranochromene with the participation of the benzopyran-2-one fragment occurs.
How to Cite
Grigoryeva, O. A.; Burov, A. M.; Fedotova, O. V. Chem. Heterocycl. Compd. 2010, 46, 409. [Khim. Geterotsikl. Soedin. 2010, 518.]
For this article in the English edition see DOI 10.1007/s10593-010-0524-z
